Question

F(X)= 3X^2-X+4
X= 1/2

Answer 1

f(x) = 3 (1/2)² - (1/2) + 4
      = 3 (1/4) - 1/2 + 4
      =  3/4 - 1/2 +4    mmmc =4
     =  (3 - 2 + 16) / 4
     = 17/4
 
 

Answer 2

Vamos lá:

$f(x)= 3x^2-x+4 ~~~~--\ \textgreater \ x = \frac{1}{2} \\ \\ f(x)= 3.(\frac{1}{2})^2-\frac{1}{2}+4 \\ \\ f(x)= 3.(\frac{1}{4})-\frac{1}{2}+4 \\ \\ f(x) = \frac{3}{4}-\frac{1}{2} + 4$

$M.m.c~(4,2,1) \\ \\ 4,2,1|2 \\ 2,1,1|2 \\ 1,1,1~~~~--\ \textgreater \ 2.2 = 2^2 = 4$

$f(x)= \frac{3}{4} - \frac{2}{4} + \frac{16}{4} \\ \\ f(x)= \frac{3-2+16}{4} \\ \\ f(x) = \frac{1+16}{4} \\ \\ f(x) = \frac{17}{4}$

Espero ter ajudado !!